package com.burt.flink.window;

import org.apache.flink.api.common.functions.FlatMapFunction;
import org.apache.flink.api.common.functions.ReduceFunction;
import org.apache.flink.api.java.utils.ParameterTool;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.windowing.time.Time;
import org.apache.flink.util.Collector;

/**
 * <p>
 * WordCount,Words are counted in time windows of 5 seconds (processing time,
 * tumbling windows)
 * </p>
 * 
 * @author luowei1
 * @since 2019/8/16 16:26
 */
public class SocketWindowWordCount {
    public static void main(String[] args) throws Exception {

        // the port to connect to
        final int port;
        try {
            final ParameterTool params = ParameterTool.fromArgs(args);
            //            port = params.getInt("port");
            port = 10086;
        } catch (Exception e) {
            System.err.println("No port specified. Please run 'SocketWindowWordCount --port <port>'");
            return;
        }

        // get the execution environment
        final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        // get input data by connecting to the socket
        //nc -l 9000
        DataStream<String> text = env.socketTextStream("c-server-4", port, "\n");

        // parse the data, group it, window it, and aggregate the counts
        DataStream<WordWithCount> windowCounts = text.flatMap(new FlatMapFunction<String, WordWithCount>() {
            @Override
            public void flatMap(String value, Collector<WordWithCount> out) {
                for (String word : value.split("\\s")) {
                    out.collect(new WordWithCount(word, 1L));
                }
            }
        }).keyBy("word").timeWindow(Time.seconds(5), Time.seconds(1)).reduce(new ReduceFunction<WordWithCount>() {
            @Override
            public WordWithCount reduce(WordWithCount a, WordWithCount b) {
                return new WordWithCount(a.word, a.count + b.count);
            }
        });

        // print the results with a single thread, rather than in parallel
        windowCounts.print().setParallelism(1);

        env.execute("Socket Window WordCount");
    }

    // Data type for words with count
    public static class WordWithCount {

        public String word;
        public long   count;

        public WordWithCount() {
        }

        public WordWithCount(String word, long count) {
            this.word = word;
            this.count = count;
        }

        @Override
        public String toString() {
            return word + " : " + count;
        }
    }
}
